<template>
    <div>
          <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
       </el-breadcrumb>
        <!-- 卡片视图区 -->
       <el-card>
           <!-- 警告区域 -->
             <el-alert
                  title="注意：只允许为第三级分类设置相关参数！"
                  type="warning"
                  show-icon
                  :closable="false"
                >
            </el-alert>
             <!-- 选择商品分类区域 -->
             <el-row class="cat_opt">
                 <el-col>
                     <span>选择商品分类：</span>
                     <!-- 选择商品分类的级联选择框 -->
                      <el-cascader
                         v-model="selectedCateKeys"
                         :options="cateList"
                         :props="cateProps"
                         @change="handleChange"
                         expand-trigger='hover'></el-cascader>
                 </el-col>
             </el-row>

             <!-- tab页签区 -->
             <el-tabs v-model="activeName" @tab-click="handleClick">
                 <!-- 添加动态参数的面板 -->
                    <el-tab-pane label="动态参数" name="many">
                        <!--这是添加参数的按钮 -->
                        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                        <!-- 动态参数表格 -->
                        <el-table :data="manyTableDate" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染Tag标签 -->
                                   <el-tag closable v-for="(item, i) of scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                   <!-- 输入的文本框 -->
                                   <el-input
                                         class="input-new-tag"
                                         v-if="scope.row.inputVisible"
                                         v-model="scope.row.inputValue"
                                         ref="saveTagInput"
                                         size="small"
                                         @keyup.enter.native="handleInputConfirm(scope.row)"
                                         @blur="handleInputConfirm(scope.row)"
                                        >
                                    </el-input>
                                    <!-- 添加按钮 -->
                                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index" label="#"></el-table-column>
                            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                             <el-table-column  label="操作">
                                 <template slot-scope="scope">
                                     <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                     <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                 </template>
                             </el-table-column>
                        </el-table>
                    </el-tab-pane>
                       <!-- 添加静态属性的面板 -->
                    <el-tab-pane label="静态属性" name="only">
                        <!-- 添加属性的按钮 -->
                         <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                          <!-- 静态属性表格 -->
                           <el-table :data="onlyTableDate" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染Tag标签 -->
                                   <el-tag closable v-for="(item, i) of scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                   <!-- 输入的文本框 -->
                                   <el-input
                                         class="input-new-tag"
                                         v-if="scope.row.inputVisible"
                                         v-model="scope.row.inputValue"
                                         ref="saveTagInput"
                                         size="small"
                                         @keyup.enter.native="handleInputConfirm(scope.row)"
                                         @blur="handleInputConfirm(scope.row)"
                                        >
                                    </el-input>
                                    <!-- 添加按钮 -->
                                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index" label="#"></el-table-column>
                            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                             <el-table-column  label="操作">
                                 <template slot-scope="scope">
                                     <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                     <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                 </template>
                             </el-table-column>
                        </el-table>
                    </el-tab-pane>
             </el-tabs>
       </el-card>

       <!-- 修改参数的对话框 -->
       <el-dialog
             :title="`修改${titleText}`"
             :visible.sync="eaitDialogVisible"
             width="50%"
             @close="eaitDoalogClosed"
            >
             <el-form :model="eaitForm" :rules="eaitFormRules" ref="eaitFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                   <el-input v-model="eaitForm.attr_name"></el-input>
                </el-form-item>
             </el-form>
            <span slot="footer" class="dialog-footer">
             <el-button @click="eaitDialogVisible = false">取 消</el-button>
             <el-button type="primary" @click="eaitParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 添加参数对话框 -->
          <el-dialog
             :title="`添加${titleText}`"
             :visible.sync="addDialogVisible"
             width="30%"
             @close="addDoalogClosed"
            >
             <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                   <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
             </el-form>
            <span slot="footer" class="dialog-footer">
             <el-button @click="addDialogVisible = false">取 消</el-button>
             <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableDate:[],
            // 静态属性的数据
            onlyTableDate:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                     { required: true, message: '请输入参数名称', trigger: 'blur' },
                ]
            },
            // 控制修改对话框的显示与隐藏
            eaitDialogVisible:false,
            // 修改的表单数据对象
            eaitForm:{},
            // 修改表单的验证规则对象
            eaitFormRules:{
                attr_name:[
                     { required: true, message: '请输入参数名称', trigger: 'blur' },
                ]
            },

        }
    },
    created(){
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        getCateList(){
            this.axios.get('categories').then(result=>{
                if(result.data.meta.status!==200) return this.$message.error('获取商品分类列表失败')
                this.$message.success('获取商品分类列表成功')
                this.cateList = result.data.data

            })
        },
        // 级联选择框选择项变化，会触发这个函数
         handleChange(value){
               this.getParamsData()
         },
        //  tab  页签点击事件的处理函数
        handleClick(){
            this.getParamsData()
        },
        // 获取参数的列表数据
        getParamsData(){
           if(this.selectedCateKeys.length !==3){
               this.selectedCateKeys=[]
               this.manyTableDate=[]
               this.onlyTableDate=[]
               return
           }

         // 证明选中的是三级分类
         // 根据所选分类的id，和当前所处的面板，获取对应的参数
         this.axios.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}}).then(result=>{
             console.log(result)
             if(result.data.meta.status!==200){
                 return this.$message.error('获取参数列表失败')
             }
             
             result.data.data.forEach(item=>{
                 item.attr_vals= item.attr_vals ?
                 item.attr_vals.split(',') :[]
                //  控制文本框的显示与隐藏
                item.inputVisible =false
                // 文本框中输入的值
                item.inputValue=''
             })
             console.log("在这里")
             console.log(result.data.data)
             this.activeName =='many' ? this.manyTableDate = result.data.data : this.onlyTableDate = result.data.data
         })

        },
        // 监听添加对话框的关闭事件
        addDoalogClosed(){
              this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(valid=>{
                if(!valid) return
                this.axios.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName}).then(res=>{
                    console.log(res)
                    if(res.data.meta.status!==201){
                        return this.$message.error('添加参数失败')
                    }
                    this.$message.success('添加参数成功')
                     this.addDialogVisible = false;
                        this.getParamsData()
                })
            })
        },
        // 点击按钮，展示修改的对话框
        showEditDialog(attr_id){
            // 查询当前参数的信息
            this.axios.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}}).then(result=>{
                
                if(result.data.meta.status!==200){
                     return this.$message.error('查询参数失败')
                }
                this.eaitForm = result.data.data
                console.log( this.eaitForm)
                this.getCateList()
                
            })
             this.eaitDialogVisible=true
        },
        // 重置修改的表单
        eaitDoalogClosed(){
           this.$refs.eaitFormRef.resetFields()
        },
        // 点击按钮， 修改参数信息
        eaitParams(){
            this.$refs.eaitFormRef.validate(valid=>{
                if(!valid) return

                this.axios.put(`categories/${this.cateId}/attributes/${this.eaitForm.attr_id}`,{attr_name:this.eaitForm.attr_name ,attr_sel:this.activeName}).then(result=>{
                    if(result.data.meta.status !==200){
                        return this.$message.error('修改参数失败')
                    }
                    this.$message.success('修改参数成功');
                    this.getParamsData()
                    this.eaitDialogVisible=false
                   
                })
                 
            })
        },
        // 根据Id删除对应的参数项
        removeParams(attr_id){ 
             this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
             confirmButtonText: '确定',
             cancelButtonText: '取消',
             type: 'warning'
        }).then(() => {
          this.$message({
            type: 'success',
            message: '删除成功!'
          });
            this.axios.delete(`categories/${this.cateId}/attributes/${attr_id}`).then(result=>{
                console.log(result)
                if(result.data.meta.status !==200) return this.$message.error('删除失败')
                // this.$message.success('删除成功');
                this.getParamsData()

            })
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          });          
        });
      },
     // 文本框失去焦点，或摁下 Enter  都会被触发
      handleInputConfirm(row){
          if(row.inputValue.trim().length===0){
              row.inputValue=''
              row.inputVisible=false
              return
          }
        //如果没有return ,则证明输入了内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        //需要发起请求，保存这次操作
        this.saveAttrVals(row)

      },
     async saveAttrVals(row){
           //需要发起请求，保存这次操作
       const {data:res} = await this.axios.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
         {
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(',')
         })
            console.log(res)
            if(res.meta.status!==200) return this.$message.error('添加参数项失败')
      },
     //点击按钮，展示文本输入框
      showInput(row){
         //让文本框自动获得焦点 
        //  $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
          row.inputVisible=true
           this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
         
      },
     //删除对应得参数可选项   
      handleClose(i,row){
           row.attr_vals.splice(i,1)
           this.saveAttrVals(row)
      }
    },

    computed:{
        // 如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName=='many'){
                return '动态参数'
            }
            else{
                return '静态属性'
            }
         
        }
    }
}
</script>
   
<style scoped>
   .cat_opt{
       margin: 15px 0
   }
   .input-new-tag{
       width: 120px
   }
</style>
